Broward County Sheriff officers, Brad Griesinger and Jamie Rubenstein (L-R) stand guard at the entrance to Marjory Stoneman Douglas High School on February 18, 2018 in Parkland, Florida.
Joe Raedle/Getty Images

Peterson allegedly waited outside the school building for about four minutes as the shooting unfolded last week. The deputy -- who was armed and in uniform at the time of the shooting -- never went in after taking a position on the west side of the building, Israel said at a Thursday afternoon news conference.

So what are school security protocols? To what extent are they armed and how are they trained to react in these situations? And what can schools do to make security more effective?

Guests:

Jeff Solomon, director of the schools division for D-PREP, where he does critical incident management for the public and private sector including K-12 schools in Southern California

Alon Stivi, CEO of Direct Measures International, a security consultancy, tactical training and protective services company that works with schools; he also runs an active shooter survival course which is funded by the Department of Homeland Security